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New chromosome numbers for plant taxa endemic to the Balearic Islands

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Abstract

Mitotic chromosome numbers are reported from 25 vascular plant taxa, endemic to the Balearic Islands that are poorly known cytogenetically. The chromosome numbers ofAnthyllis vulneraria subsp.balearica (2n=12),Cymbalaria fragilis (2n=56), andPolygonum romanum subsp.balearicum (2n=40) were determined for the first time. A new chromosome number was found in several populations ofAnthyllis hystrix (2n=70) suggesting that this species is decaploid, in contrast to an earlier work reporting a higher ploidy level (2n=12x=84). The new chromosome number 2n=32 was reported inHypericum hircinum subsp.cambessedesii. It is suggested that the previous count (2n=40) could be explained by the presence of anomalous pentaploid cells in some tissues, contrating with the presence of a regular tetraploid complement (2n=32). Cytogenetic observations suggest thatSibthorpia africana has a diploid chromosome complement of 2n=18, with 0–2 accessory chromosomes. Accessory chromosomes are also reported forPhlomis italica, being the first record of B chromosomes in this genus. Chromosomal instability was found inGalium crespianum andG. friedichii species, with three numbers 2n=44, 55 and 66. Two cytotypes differing in ploidy level were documented within single plants. It is suggested that both species share a regular complement of 2n=44 and that the past hybridization events and formation of regenerating roots from the typical rootstock ofG. crespianum andG. friedrichii could be involved in the genesis of chromosome variants through partial endopolyploidy and concomitant somatic segregation.

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Authors and Affiliations

  1. Facultad de Agronomia, Universidad Central de Venezuela, Apartado 4579, 2101, Maracay, Venezuela

    Mercedes Castro

  2. Jardí Botànic, Universidad de Valencia, c/Quart 80, E-46008, Valencia, Spain

    Josep A. Rosselló

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  1. Mercedes Castro
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  2. Josep A. Rosselló
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Correspondence to Josep A. Rosselló.

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Castro, M., Rosselló, J.A. New chromosome numbers for plant taxa endemic to the Balearic Islands. Folia Geobot 41, 433–451 (2006). https://doi.org/10.1007/BF02806559

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